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A123800 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 6 on top of a fixed block of the same size so that the building is flat, i.e., with all blocks in parallel position. 0
11, 136, 1991, 30701, 500038, 8346595, 142812582, 2481290457, 43703296703 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The base block is not counted among the n and must be the only block in the bottom layer of the building.

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Cf. A112389, A123762 - A123827, A123829 - A123849.

Sequence in context: A227101 A024143 A057718 * A233258 A262382 A142895

Adjacent sequences:  A123797 A123798 A123799 * A123801 A123802 A123803

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)